Steam-boiler crown-bar.



Patented Dec. 4, |900- amm/.1 STEAM BUILER CROWN BAR..`

(Application led Sept. 12, 1900.) (In Bladel.)

@noe/141700 c. we imams Pzzns co., Prvwruu'mn, WASHINGTON, n

` necessary.

UNITED STATES EDWIN CLAY, OF WADSWORTH, NEVADA.

ST'EM-BOILER CROWN-BAR.

SPECIFICATION forming part of Letters Patent No. 663,064, dated December 4, 1900.

' Application filed september 12,1900. serai No. 29,755. No model.)

To a/Z whom t may concern.-

Be it known that I, EDWIN CLAY, a citizen of the United States, residing at Wadsworth, county of Washoe, State of Nevada, have invented an Improvement in Steam-Boiler Crown-Bars; and 1 hereby declare the follow, ing to be a full, clear, and exact description of the same.

My invention relates to devices for bracing and supporting the crown-sheet of steamboiler furnaces. r

It consists of bars formed with parallel sides and transverse connecting members adapted to receive the stay-bolts which pass through the crown-sheet and into said cross members. The bars thus constructed have flanges or plates formed upon their ends, with curvatures which fit and are bolted to the shell of that portion of the boiler above the crown sheet and technically termed the wagon-top.

My invention also comprises details of construction which will be more fully explained by reference to the accompanying drawings, in which- Figure l is a vertical section through the bar and connections. Fig. 2 is a view of the same.

It has been'customary in this class of structures to extend the @crown-bars, so called,

vabove the crown-sheet, and the ends are formed with toes, which are secured to the upper edges of the inner sheets of the water-V leg. Washers are fitted between the crownbar and the top of the sheet, and bolts pass through the bar, the washers, and the sheet, and thus support and stay the latter against the internal pressure ofthe steam. This construction is objectionable, first, because at the fastening-points and under the washers the water is kept away from the sheets and the latter are liable to be burned ont by the heat from the opposite side, and, secondlyjtis necessary to remove parts of the superstructure of the boiler to enable a workman to get into the interior for the purpose of repairs when My invent ion is designed to overcome these defects and to provide a superior stay for the crown-sheet.

In the drawings I have illustrated a sufticient portion of that part of the boiler which is situated above the crown-sheet to show the application of my invention.

A is the curved shell or Wagon-,top of the boiler, which extends down uponeach side and connects with the outer shell of the water-legs 2. t

3 is the crown-sheet, which extends across above the lire-box 4 ot' the furnace, and the edges of the crown-sheet are lianged and riveted to the inner sheets 5 of the water-legs,

as shown.

The crown-bar is made of cast-steel or other suitable material and consists of the side plates (i and the transverse connecting-ribs 7.

The ends of the crown-bar are formed with curved plates or flanges 8, which extend suf- `iciently above and below the bar and have holes made through them to receive the rivets 9, by which they are secured to the outer shell A, so that the crown-bars extend across the interior of the boiler above the crownsheet 3.

Each pair of the transverse ribs 7 of the crown-bar has a bottom plate lO of sucient thickness, and through this is made a screwthreaded hole of sufficient diameter to receive the correspondingly-threaded end of the stay-bolt ll. These bolts may be formed with heads upon them, as shown at 12, and the hole in the crown-sheet being made vertically in line with the holes in the crown- -bars the bolts can be inserted from within the lire-box and screwed nup into the crown-bar,

so as to form a complete support and stay for the crown-sheet.

It will be understood that there are as many crown-bars extending across above the crown-sheet as the length of the firebox makes necessary, the distance between the centers of the bolts being such that the crownsheet will have an ample support therefrom, and if desired the bolts may be screwed into the ribs 7 of the crown-bar, and the Alower IOO action of the heat upon the opposite side. The crown-bars being supported from and secured to the outer shell do not contact With any part which is subjected to the direct action of the fire. The stay rods or links 13 are connected with the top of the boiler-shell by lugs 14 and are here shown in pairs extending down to near the crown-bar, With which they are connected by a loose intermediate link 15, which allows for any necessary adjustment in making the connection or Which may be caused by expansion and contraction of the parts. Crown-bars made in this inanner not onlyserve to sustain the crown-sheet, but also form the transverse stays between .the sides of the boiler, and thus obviate the necessity for stay-rods between the crown-bars. Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. A crown-bar for boilers consisting of a singleintegral structure including parallelv crown-sheet and into said holes in the crown# bars.

3. Grown-bars for boilers consisting of a single integral structure including parallel plates with transverse connecting-ribs adapted to receive the crown-sheet stay-bolts and end extensions fitting the interior of the .boiler-shell, all parts being made integral `ol" cast-steel.

4. Crown-bars for boilers, consisting of parallel vertically-disposed plates with integral transverse connecting-ribs and end plates fitting and adapted to be secured to the exterior ED vv' 1N CLA x Witnesses:

l S. H. NoURsE,

OHAs. E. TOWNSEND. 

